NO, a Dirty Sanchez is performed when a male fingers a female's ass and wipes the reminants on the female's upper lip. What you referred to below, when a male inserts his penis in a female's ass then transfers the fecal matter from his penis to the female's upper lip is the Dirty Rodruigez, the first cousin of the Dirty Sanchez. Don't feel bad though, they are commonly confused.

The man's index finger was smelly after administering a dirty sanchez.

A dirty sanchez occurs when a male places both pinky fingers together and inserts them into the female anal cavity. Once the pinkies have been removed, ass pounding ensues and a reach around occurs. Any fecal remnants are smudged above the upper lip which creates a mustache of sorts.

Since my lady friend is such a big fan of anal sex I felt it would be a great idea to give her a dirty sanchez.

2-A Welsh version of Jackass but funnier. Contains such Gems as- Arse grip tape slaloms, Running over dation with a car, Is this Ice cold? and it sequel OH MY FUCKING GOD THAT ICE IS COLD! and Slaps (A game involving Well, Slapping). Some Banned senes involving Piss and shit eating, Giving himself a knob Piercing and running into a Bull. Shockingly, the bull wins. Also One seen called ‘Beer Enema’ Where one guy gets a Enema with beer and another drinks it. This has to be seen to be believed… Only On MTV UK (I think)